The router can be upgraded using the default Sercomm edited bootloader by giving it a complete flash image (4MiB) with the bootloader included (although it won't be flashed) using the same [[http://​www.everbesthk.com/​8-download/​sercomm/​firmware/​NU54/​Upgrade_207_XP.zip|windows utility]] used with the NSLU2. Upslug doesn'​t work due to some hardcoded parameters and my lack of familiarity with it, so I can't modify it to make it work. If somebody wants to help, it just needs to be modified to work with 4MiB images, without modifying the first 256KiB that contain the u-boot.

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The process is this:

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Press the WPS button on top of the unit

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Connect power

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Two router leds should start blinking alternatively

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Start the program, press the "two arrows/​refresh"​ button

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Click on the mac address, then file, then open the firmware image, then upgrade.

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The router will reboot automatically at the end of the upgrade process.

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==== Upgrading OpenWrt ====

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-> [[doc:​howto:​generic.sysupgrade]]

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If you have already installed OpenWrt and like to reflash for e.g. upgrading to a new OpenWrt version you can upgrade using the mtd or sysupgrade command line tool. It is important that you put the firmware image into the ramdisk (/tmp) before you start flashing.

If the bootloader is working just use the Recovery method and flash a full firmware image.

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===== Bootloader Notes =====

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- The last 64KiB block in flash contains a signature (ascii eRcOmM) that is checked at every boot, if missing the router boots in recovery mode and the firmware needs to be flashed again to fix it.

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===== Hardware mods =====

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- as a beginner, you really should inform yourself about [[doc:​hardware:​soldering]] in general and then obtain some practical experience!

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==== 32/​64/​128MiB RAM Mod ====

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Just add/replace the ram chips with bigger 133MHz+ SDR SDRAM chips, the bootloader detects the size of the ram automatically. You can source those in SDR SDRAM SODIMM modules for a few bucks on eBay.

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==== USB header ====

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You'll need a USB Female receptacle.

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Just connecting/​soldering the wires DM/DP on pcb to the D-/D+ wires will give you an unpowered USB 2.0 Host. To add power you need to solder a LM1117 + 2 10u 6v + 2 1u 6v capacitors in the blanks at the back of the board.

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==== Ext. Antenna ====

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Buy 2 u-fl sockets on eBay and solder them in the appropriate spots in the PCB (where the antenna cables are soldered), then use them however you wish.

Boots a specific image build with WIP patches soon to be applied in trunk. Has problems with wifi and leds don't work because the GPIOs where they are are not known, plus they'​re unlabeled on the device itself and on the manual.